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**satishg** · 09-18-2010, 02:49 PM

RX-K barell has high and wide exhaust port (even higher than our 5 speed) , bigger transfers . need to rev to the limits to feel the power,better top end, but all fun on highways only

**karthikdattag** · 09-28-2010, 09:44 AM

Originally posted by karthikdattag View Post

I am trying my best to source one. Once i have it, i shall post a pic.

but i am quite sure i will have one someday.

Ladies (If any) & Gentlemen, presenting the "ART" pistons, STD till 1.00mm sizes. Enjoy the pic.

- Karthik..

**RX88** · 10-02-2010, 08:30 PM

1,2,3,4,5

cant say further....

**karthikdattag** · 10-11-2010, 04:09 PM

Basic Component Differences Between 4-Speed & 5-Speed RX135s

Dear All,

Here i am listing down some basic component differences between 4-speed & 5-speed RX135 (Includes RXG), which will help people to differentiate.

1. Bore Kit (a.k.a Piston-Cylinder Kit / Barrel / Block)

4-Speed - '4TL00' with OEM "ART" STD piston '4Y201'
5-Speed - '4TL10' with OEM "ART" STD piston '4Y201'

Note1: To check the originality, the LH side of Cylinder (Gear shift side) has 4TL00 or 4TL10 marking along with 132cm3 (which is the displacement) and the RH side (Crank Kicker Side) has the batch of manufacturing, for ex., E1, E2, E3 or E4 (All of them have exactly similar performance, people who swear by performance of E1 being the best, is all crap.) Also if nothing is mentioned or some other type code is mentioned, then the Cylinder is a fake, except for '4Y201' which is the original block of RX-K.

Note2: Displacement calculation

For Std RX135 being a single cylinder engine, we have the following inputs,

Bore Dia = 58mm
Bore Radius = 58/2 = 29mm
Bore Radius Squared = 841mm2
Stroke Length = 50mm
Pi = 22/7 = 3.142857 (Corrected upto 6 decimals)
Number of Cylinders = 1

Displacement in mm3 = Stroke x Bore Radius Squared x Pi x No. of Cylinder
= 50 x 841 x 3.142857 x 1
= 132157.143

Displacement in cm3 = 132157.143/1000
= 132.157 (Corrected upto 3 decimals)

2. Piston Kit

The OEM Piston kit for Indian RX135 series are from "ART" Japan. For Indian models pisoton sizes from STD to 0.5mm are available (in steps of 0.25mm). On careful observation of the piston, one can identify if it is original or not. Simply turn the piston upside down & inside we can see "ART" & "4Y201" clearly written. This is the proof for original piston. The piston kit essentially comprises of

Piston (STD/0.25mm/0.5mm)
Piston Rings
Piston Pin
Clips

3. Carburettor Assembly

The OEM Carb assembly for RX135 is Mikuni / UCAL Mikuni. The Carb assembly are different for both 4-Speed & 5-Speed versions.

4-Speed: '4TL01' with Main Jet = 165 & Pilot Jet = 17.5
5-Speed: '4TL20' with Main Jet = 135 & Pilot Jet = 15.0

These are VM type of Carburettors manufactured by Mikuni & both are 22mm. Additonally VM24 & VM26 are used for RX available in South-East Asian countries (Like Singapore, Indonesia & Malaysia) and in South American Countries (Like Peru, Argentina & Brazil). The details of these are given below:

VM24: '2YA00' with Main Jet = 145 & Pilot Jet = 20.0
VM26: '55K00D' with Main Jet = 210 & Pilot Jet = 22.5

These carbs (VM24 & VM26) are direct fit to Indian RX135s with some minor jetting changes required based on the Power output of the engine.

Note: The type code is mentioned just above the 2-T oil Inlet in the carb, with that the originality can be confirmed.

4. Head Assembly

The heads are also different for 4-speed & 5-speed. The type code is mentioned below:

4-Speed: '4TL5' written on bottom of Head
5-Speed: '09L' written on bottom of Head

5. Clutch Bell Assembly with Primary drive

The clutch bell assembly are the same for 4-speed & 5-speed RX135, but it is different for RX-G. Below are the difference of teeth mentioned:

4-Speed/5-Speed: Main Bell = 74 Teeth
Primary Drive = 20 Teeth

RX-G : Main Bell = 71 Teeth
Primary Drive = 23 Teeth

6. Chain Sproket

The sproket (Front & Rear) are all different for entire RX series. Detailed info given below:

4-Speed: 16T / 34T
5-Speed: 15T / 38T
RX-G : 15T / 37T

7. Gear Box
The Gearbox are obviously different for 4-speed & 5-speed. Details below:

4-Speed:
1st = 35/11 = 3.182
2nd = 30/15 = 2.000
3rd = 26/19 = 1.368
4th = 23/23 = 1.000

5-Speed:
1st = 35/11 = 3.182
2nd = 30/15 = 2.000
3rd = 26/19 = 1.368
4th= 24/23 = 1.043
5th = 22/23 = 0.957

This is all that I can recollect as of now. Any comments/additions are welcome.
-Karthik..

**SriramEfunds** · 10-11-2010, 04:28 PM

^ Karthik, this is wonderful information for people who would like to have clarification Yamaha RX series. I truly appreciate it.

**BigBore** · 10-11-2010, 05:30 PM

Great info Karthik

**aalop143** · 10-11-2010, 08:48 PM

great work done, karthik lots of new member got help from it. big cheers for u

**RX88** · 10-11-2010, 09:54 PM

excellent piece of work

highly appreciate...........!!!!!

**satishg** · 10-11-2010, 10:34 PM

this thread should be made sticky

great effort karthik, will be a great help for never say die RX fans

**satishg** · 10-11-2010, 10:36 PM

need a clue !

anyone got an idea of what alloys are used on the Z ,suits the OE brembo disc also !

tried mailing the owner but no response

Team-BHP Classifieds - Yamaha RXZ 5Speed - Powered by PhotoPost Classifieds

**yamdoot** · 10-20-2010, 02:58 AM

nice! whats the number? BTW.. you get genuine NGKs at YAMAHA showrooms.

**arvindraju** · 10-20-2010, 10:02 AM

Originally posted by yamdoot View Post

nice! whats the number? BTW.. you get genuine NGKs at YAMAHA showrooms.

this is 4092

**1eighty** · 10-27-2010, 10:12 AM

Originally posted by karthikdattag View Post

Yes. I will rather not run my bike than using that Godzilla. And yes 0.75mm ART does exist. I am trying my best to source one. Once i have it, i shall post a pic.

As far as big-bore project is concerned, i am not very keen on doing it. The STD sleeve will of be no use for this big-bore project. I mean its really crazy to convert from 132cc to 174cc just to use good pistons.

Anyways i am still clueless as to where to get those lovely "ART" upsize pistons, but i am quite sure i will have one someday.

Which piston do I need to use for the 175 cc oversize? I do need a conversion to 175cc for an RX135 4 Speed. Is it too unreliable? Sorry, didn't see the post in time, so this quote.

**jagadeesh.b** · 10-27-2010, 11:25 AM

For the bigbore ppl generally use RD350 piston. ofcourse you need to put in a new sleeve

**karthikdattag** · 10-28-2010, 10:27 AM

Originally posted by 1eighty View Post

Which piston do I need to use for the 175 cc oversize? I do need a conversion to 175cc for an RX135 4 Speed. Is it too unreliable? Sorry, didn't see the post in time, so this quote.

Originally posted by jagadeesh.b View Post

For the bigbore ppl generally use RD350 piston. ofcourse you need to put in a new sleeve

Let us talk mathematically here,

1. Displacement calculation for RX135

For Std RX135 being a single cylinder engine, we have the following inputs,

Bore Dia = 58mm
Bore Radius = 58/2 = 29mm
Bore Radius Squared = 841mm2
Stroke Length = 50mm
Pi = 22/7 = 3.142857
Number of Cylinders = 1

Displacement in mm3 = Stroke x Bore Radius Squared x Pi x No. of Cylinder
= 50 x 841 x 3.142857 x 1
= 132157.143

Displacement in cm3 = 132157.143/1000
= 132.157 (Corrected upto 3 decimals)

2. Displacement calculation for RD350

For Std RD350 being a Twin cylinder engine, we have the following inputs,

Bore Dia = 64mm
Bore Radius = 64/2 = 32mm
Bore Radius Squared = 1024mm2
Stroke Length = 54mm
Pi = 22/7 = 3.142857
Number of Cylinders = 2

Displacement in mm3 = Stroke x Bore Radius Squared x Pi x No. of Cylinder
= 54 x 1024 x 3.142857 x 2
= 347574.8571

Displacement in cm3 = 347574.8571/1000
= 347.574 (Corrected upto 3 decimals)

3. Displacement calculation for DT175

For Std DT175 being a single cylinder engine, we have the following inputs,

Bore Dia = 66mm
Bore Radius = 66/2 = 33mm
Bore Radius Squared = 1089mm2
Stroke Length = 50mm
Pi = 22/7 = 3.142857
Number of Cylinders = 1

Displacement in mm3 = Stroke x Bore Radius Squared x Pi x No. of Cylinder
= 50 x 1089 x 3.142857 x 1
= 171128.571

Displacement in cm3 = 171128.571/1000
= 171.128 (Corrected upto 3 decimals)

The first & foremost observation is, the stroke length must match, if you see the above 3 cases, RD350 stroke length is greater than that of RX135/DT175. Hence the best fit would be a DT175 piston for RX135.
As to which make of piston, the answer is "ART" or "WISECO".
If at all you want to fit an RD350 piston, then the stroke length will have to be changed, that is one big headache job. Your existing crank+con-rod will not work with this.
Now coming to the rate part, a DT175 Std piston cost approx., $159.52 = 7089 INR (As per today's exchange rate). Now would you want to invest 7000INR for just a piston is really your call & then the proper mods for Re-sleeve job, associated Porting job, work on bottom end, work on head, the complete setup needs to be changed. And at the end of all this, there is no guarentee that the bike will perform like an RX.
My advice is go for max. 2mm oversize, beyond which its not economical or feasible; i.e go for 60mm piston max. This is what i follow. Trust me, CC has no relation to BHP, its all about the port job. Just an ex., a Suzuki Shogun (110cc) can smoke a RX135 (135cc), only because its 14BHP & 2BHP more than RX135.

Hope this was of some use.

- Karthik..

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